[Bug 228934] objcopy (from elftoolchain) does not set ELF OS/ABI field for binary->ELF conversion

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228934

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: emaste
Date: Tue Jun 12 13:32:42 UTC 2018
New revision: 334998
URL: https://svnweb.freebsd.org/changeset/base/334998

Log:
  linux64: use linux output target for linux_vdso.so

  linux_vdso.so provides the vdso for the linuxulator's amd64 target and
  is mapped into a Linux binary's address space.  Thus it should be a
  Linux-style .so, which has the ELF OS/ABI unset.

  It turns out that ELF Tool Chain elfcopy/objcopy also has a bug where
  the OS/ABI field is unset, regardless of the specified --output-target,
  so this change is a no-op with the default in-tree toolchain.  This is a
  real fix when using external binutils, and the ELF Tool Chain bug will
  be fixed in the future.

  PR:           228934
  Sponsored by: Turing Robotic Industries

Changes:
  head/sys/modules/linux64/Makefile

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